distribute	reads
0-500	867
500-800	1497
800-1000	1180
1000-1200	1728
1200-1400	3008
1400-1600	4849
1600-1800	6538
1800-2000	6653
2000-2200	5903
2200-2400	5579
2400-2600	3258
2600-2800	2376
2800-3000	1750
>3000	5192
